Dont delete coaches.

main/cron/import_csv.php

@@ -552,7 +552,7 @@ class ImportCsv
                     );
                     $result = CourseManager::update_attributes($courseInfo['real_id'], $params);
 
-                    //CourseManager::updateTeachers($courseInfo['id'], $row['teachers'], true);
+                    CourseManager::updateTeachers($courseInfo['id'], $row['teachers'], true);
 
                     if ($result) {
                         $this->logger->addInfo("Courses - Course updated ".$courseInfo['code']);

main/inc/lib/course.lib.php

@@ -4053,7 +4053,7 @@ class CourseManager {
                     foreach ($teachers as $userId) {
                         SessionManager::set_coach_to_course_session($userId, $session['id'], $course_code);
                     }
-                    $teachersToDelete = array();
+                    /*$teachersToDelete = array();
                     if (!empty($alreadyAddedTeachers)) {
                         $teachersToDelete = array_diff(array_keys($alreadyAddedTeachers), $teachers);
                     }
@@ -4062,7 +4062,7 @@ class CourseManager {
                         foreach ($teachersToDelete as $userId) {
                             SessionManager::set_coach_to_course_session($userId, $session['id'], $course_code, true);
                         }
-                    }
+                    }*/
                 }
             }
         }